405  Stamp
How many stamps? 2

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There are 190 stamps which are 8-cent stamps and 3-cent stamps. Altogether they cost 1020 cents. How many 8-cent stamps are there?



There are 160 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1110 cents. How many 6-cent stamps are there?



There are 170 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 750 cents. How many 6-cent stamps are there?



There are 210 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1790 cents. How many 8-cent stamps are there?



There are 190 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 1020 cents. How many 6-cent stamps are there?



There are 250 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1970 cents. How many 7-cent stamps are there?



There are 160 stamps which are 6-cent stamps and 4-cent stamps. Altogether they cost 820 cents. How many 6-cent stamps are there?



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There are 190 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1050 cents. How many 3-cent stamps are there?



There are 210 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1500 cents. How many 6-cent stamps are there?



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405    90 110 80 100 130 ( 510 )   140 90 90 70 130 ( 520 )   [[ 1030 ]]